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Synthetic method for controllable lithium ion battery cathode material lithium iron phosphate

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as general electrochemical capacity, processing performance, and general consistency performance.

Active Publication Date: 2012-12-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium iron phosphate material prepared by the ferrous oxalate line and the iron phosphate line performed better on the capacity, rate performance and voltage platform of the discharge curve, but its processing performance and consistency were average; the lithium iron phosphate synthesized by the iron oxide line The consistency of material capacity and processing performance are excellent, but the electrochemical capacity is average

Method used

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  • Synthetic method for controllable lithium ion battery cathode material lithium iron phosphate
  • Synthetic method for controllable lithium ion battery cathode material lithium iron phosphate
  • Synthetic method for controllable lithium ion battery cathode material lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 2000g of micron-sized iron oxide, 2740g of battery-grade lithium dihydrogen phosphate, 196g of magnesium acetate and 104g of sucrose, and add the raw materials to a stirring mill added with 5000mL of deionized water, control the stirring speed at 500 rpm, stir and grind 4h. Add 2000 mL of deionized water, add 216 g of acetylene ink into the stirring mill, control the stirring speed at 500 rpm, and stir and grind for 1 hour. The ground slurry was spray-dried to obtain a dry precursor powder, and the dry precursor powder was calcined at 650° C. for 4 hours under the protection of nitrogen to obtain a calcined material. Weigh 2000g of calcined material and 80g of sucrose, add deionized water according to 50% solid content, grind in a stirring mill for 1h, spray dry and collect the slurry to obtain secondary dry material. The above-mentioned secondary dried powder was kept at 750° C. under nitrogen protection for 4 hours to obtain a carbon-coated lithium iron phospha...

Embodiment 2

[0025] Weigh 2000g of micron-sized iron oxide, 2740g of battery-grade lithium dihydrogen phosphate, 156.8g of magnesium acetate and 72.8g of sucrose, and add the raw materials to a stirring mill with 5000mL of deionized water, and control the stirring speed at 500 rpm. Stir and grind for 2h. Add 2000 mL of deionized water, add 296.6 g of acetylene ink into the stirring mill, control the stirring speed at 500 rpm, and stir and grind for 1 hour. The ground slurry was spray-dried to obtain a dry precursor powder, and the dry precursor powder was calcined at 650° C. for 4 hours under the protection of nitrogen to obtain a calcined material. Weigh 2000g of calcined material and 80g of sucrose, add deionized water according to 50% solid content, grind in a stirring mill for 1h, spray dry and collect the slurry to obtain secondary dry material. The above-mentioned secondary dried powder was kept at 750° C. under nitrogen protection for 4 hours to obtain a carbon-coated lithium iron ...

Embodiment 3

[0027] Weigh 2000g of micron-sized iron oxide, 2740g of battery-grade lithium dihydrogen phosphate, 156.8g of magnesium acetate and 182g of sucrose, and add the raw materials to a stirring mill added with 5000mL of deionized water, control the stirring speed at 500 rpm, and stir Grinding for 3h. Add 2000 mL of deionized water, add 273 g of acetylene ink into the stirring mill, control the stirring speed at 500 rpm, and stir and grind for 1 hour. The ground slurry was spray-dried to obtain a dry precursor powder, and the dry precursor powder was calcined at 650° C. for 4 hours under the protection of nitrogen to obtain a calcined material. Weigh 2000g calcined material, 80g sucrose and 60g polyvinyl alcohol, add deionized water according to 50% solid content, grind in a stirring mill for 2h, spray dry the slurry and collect it to obtain secondary dry material. The above-mentioned secondary dried powder was kept at 750° C. under nitrogen protection for 4 hours to obtain a carbo...

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Abstract

The invention discloses a synthetic method for a controllable lithium ion battery cathode material lithium iron phosphate. The method comprises the following steps: carrying out ball milling and uniform mixing on micrometer iron oxide, lithium dihydrogen phosphate, doping metal acetate and a composite carbon source in a certain weight ratio in a water system, adjusting the concentration of mixture slurry and carrying out spray drying so as to prepare dry precursor powder with good fluidity; subjecting the dry precursor powder to heat treatment at a temperature of 450 to 700 DEG C for 2 to 10 h under the protection of nitrogen so as to obtain a pre-sintered material; and carrying out ball milling and mixing on the pre-sintered material and a carbon source in a certain weight ratio in the water system, adjusting the concentration of mixed slurry of the pre-sintered material, carrying out spray drying so as to prepare secondary dry powder, maintaining the secondary dry powder at a temperature of 650 to 750 DEG C for 2 to 10 h and sieving the cooled sintered material so as to obtain lithium iron phosphate. The lithium iron phosphate material prepared in the invention has the characteristics of adjustable processing performances and adjustable electrochemical performances; through fine adjustment of a formula and a process for the lithium iron phosphate material, parameters like a specific surface area, carbon content, granularity of primary particles, tap density and electrochemical performances of lithium iron phosphate can be changed, and therefore, demands of different electrical core preparation processes are met on the basis that process route does not change.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a method for controllably synthesizing lithium iron phosphate, a positive electrode material of a lithium ion battery. Background technique [0002] Among the cathode materials for lithium-ion batteries, lithium iron phosphate has the best overall performance, and is currently considered to be an ideal cathode material for lithium-ion secondary power batteries. At present, the main methods for synthesizing lithium iron phosphate include high-temperature solid-phase method, hydrothermal method, liquid-phase redox method, and sol-gel method. Patents CN1948134A, CN101152961A, CN101172599A, etc. use different processes to process and add high-temperature solid-phase sintering to form lithium iron phosphate materials. The prepared materials can meet the production requirements of lithium battery cells. Due to the consideration of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘大军谢佳杨续来杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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